#ifndef __HWTIMER_H__
#define __HWTIMER_H__

#include <rtthread.h>
#include <rtdevice.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Timer Control Command */
typedef enum {
	HWTIMER_CTRL_FREQ_SET = 0x01,    /* set the count frequency */
	HWTIMER_CTRL_STOP,               /* stop timer */
	HWTIMER_CTRL_INFO_GET,           /* get a timer feature information */
	HWTIMER_CTRL_MODE_SET            /* Setting the timing mode(oneshot/period) */
} rt_hwtimer_ctrl_t;

/* Timing Mode */
typedef enum {
	HWTIMER_MODE_ONESHOT = 0x01,
	HWTIMER_MODE_PERIOD
} rt_hwtimer_mode_t;

/* Time Value */
typedef struct rt_hwtimerval {
	rt_int32_t sec;      /* second */
	rt_int32_t usec;     /* microsecond */
} rt_hwtimerval_t;

#define HWTIMER_CNTMODE_UP      0x01 /* increment count mode */
#define HWTIMER_CNTMODE_DW      0x02 /* decreasing count mode */

struct rt_hwtimer_device;

struct rt_hwtimer_ops {
	void (*init)(struct rt_hwtimer_device* timer, rt_uint32_t state);
	rt_err_t (*start)(struct rt_hwtimer_device* timer, rt_uint32_t cnt, rt_hwtimer_mode_t mode);
	void (*stop)(struct rt_hwtimer_device* timer);
	rt_uint32_t (*count_get)(struct rt_hwtimer_device* timer);
	rt_err_t (*control)(struct rt_hwtimer_device* timer, rt_uint32_t cmd, void* args);
};

/* Timer Feature Information */
struct rt_hwtimer_info {
	rt_int32_t maxfreq;    /* the maximum count frequency timer support */
	rt_int32_t minfreq;    /* the minimum count frequency timer support */
	rt_uint32_t maxcnt;    /* counter maximum value */
	rt_uint8_t  cntmode;   /* count mode (inc/dec) */
};

typedef struct rt_hwtimer_device {
	struct rt_device parent;
	const struct rt_hwtimer_ops* ops;
	const struct rt_hwtimer_info* info;

	rt_int32_t freq;                /* counting frequency set by the user */
	rt_int32_t overflow;            /* timer overflows */
	float period_sec;
	rt_int32_t cycles;              /* how many times will generate a timeout event after overflow */
	rt_int32_t reload;              /* reload cycles(using in period mode) */
	rt_hwtimer_mode_t mode;         /* timing mode(oneshot/period) */
} rt_hwtimer_t;

rt_err_t rt_device_hwtimer_register(rt_hwtimer_t* timer, const char* name, void* user_data);
void rt_device_hwtimer_isr(rt_hwtimer_t* timer);

#ifdef __cplusplus
}
#endif

#endif
